With the widespread use of real-time applications (VoIP, IPTV, Video conference, etc.) in Internet, protection and resource optimization become increasingly desired. Network protection aims to decrease the interruption time of communications by precomputing backup paths capable to receive and route traffics of affected primary paths upon failures. Resource optimization is achieved by improving ...

This paper presents vPFS, a new parallel file system performance management approach to support the allocation of shared storage bandwidth on a per-application basis. Existing parallel file systems are unable to differentiate I/O requests from different applications and meet per-application bandwidth requirements. This limitation presents an increasing hurdle for applications to achieve their d...

Recent advances in technology enable public or commercial establishments and individual data plan subscribers to operate as Wi-Fi providers, offering Internet access. However, the model of a monthly flat service fee charged by ISP to establishment or individual WFPs offers very little incentives for ISP to provide additional bandwidth to WFPs customers. Thus, these users may experience insuffic...

One critical issue in tra c management of ATM networks is, to achieve the balance between two seemingly con icting goals: to guarantee the Quality of Service (QoS) for all service classes, while still allowing enough statistical sharing of bandwidth so that the network is e ciently utilized. Guaranteeing QoS requires tra c isolation, as well as allocation of enough network resource (e.g. bu er ...

Generalized MultiProtocol Label Switched (GMPLS) control-plane protocols have been standardized to enable dynamic call-by-call bandwidth sharing in circuit-switched/virtual-circuit (VC) networks. Most GMPLS control-plane implementations within controller cards of circuit/VC switches only support an immediate-request mode of bandwidth sharing because the signaling protocols within the GMPLS cont...

Accommodating many users in a small area is a major issue in the communication system. Frequency spectrum sharing and time sharing are used in the conventional systems. Hence, they have limitation on the capacity of the system. With the advent of spread spectrum, many users can be accommodated within the fixed bandwidth by making use of certain coding properties over the bandwidth. However, thi...

To adapt the data rate in accordance with the quality of the link, the IEEE 802.11b standard proposes the variable rate shifting functionality. This intrinsic functionality of the 802.11b products progressively degrades the bit rate when a host detects unsuccessful frame transmissions. Furthermore, the basic CSMA/CA channel access method guarantees that the long-term channel access probability ...

In this paper, we present a study of information sharing policies used by well-known load balancing systems. Our approach comes from analyzing the performance scalability of: response time (time of reaction against instabilities) and bandwidth, from a communication-intensive application context. We divided the policies into: Centralized or Distributed oriented; and Eager or Lazy load informatio...

AhstructIn this paper we introduce a statistical method tn analyze multiplexing of multiple sessions sharing link bandwidth using GPS scheduling. Our method is shown to substantially improve previous upper bounds for GPS scheduling of MMPP sessions, especially as the number of sessions increases. Application of analytical results to admission control indicate that by sharing handwidth using GPS...

One critical issue in tra c management of ATM networks is, to achieve the balance between two seemingly con icting goals: to guarantee the Quality of Service (QoS) for all service classes, while still allowing enough statistical sharing of bandwidth so that the network is e ciently utilized. Guaranteeing QoS requires tra c isolation, as well as allocation of enough network resource (e.g. bu er ...